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Backplane connectors can be divided into 3 main categories, Hard Metric, Standard and High Density Low Profile. The first two are the main focus of this article as they are the industry standard connectors.
Hard Metric connectors are comprised of multiple components including the PCB, the backplane connector itself, and the accompanying cable connecting the two. The PCB and cable are generally designed to be compatible with the connector specifications. The use of Hard Metric connectors is becoming more popular and many high-end computing systems are beginning to incorporate them due to their improved performance.
Hard Metric connectors offer a fast and reliable connection between the PCB and backplane. The connectors are designed using a multi-layered dielectric to ensure maximum signal integrity and noise rejection. They are also resistant to EMI (electromagnetic interference), resulting in better data transfer rates. The connectors also have excellent mechanical characteristics, allowing them to withstand a wide range of temperatures, humidity levels, and physical shock.
Standard backplane connectors are much simpler and are primarily used in lower speed applications. Standard connectors offer a wide variety of options in terms of pin and wire layout, as well as tolerance levels. This makes them suitable for a variety of applications. They also offer a good level of EMI protection and are relatively inexpensive.
The primary difference between Hard Metric and Standard connectors is in the form factor. Hard Metric connectors are often two or three times thicker than Standard connectors. This makes their use more suitable for higher speed applications where the extra thickness helps to reduce the risk of signal integrity issues. Standard connectors are often easier to install and offer improved signal integrity at lower speeds.
Regardless of the type of backplane connector being used, it is important to consider the application\'s requirements and consider the various options available. Hard Metric and Standard connectors offer a good solution for most applications, however, the technology is ever evolving and newer, more efficient solutions may be available.

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